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Röntgenstrukturanalysen an Einkristallen von Ce2S3 im A- und C-Typ

✍ Scribed by Thomas Schleid; Petra Lauxmann

Publisher
John Wiley and Sons
Year
1999
Tongue
German
Weight
100 KB
Volume
625
Category
Article
ISSN
0372-7874

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✦ Synopsis

Dark red, lath-shaped single crystals of A-type Ce 2 S 3 (orthorhombic, Pnma, a = 753.23(6), b = 409.67(3), c = 1572.76(9) pm, V m = 73.065(8) cm 3 /mol, Z = 4) are obtained along with deep red, bead-shaped single crystals of C-type Ce 2 S 3 (cubic, I 4 3d, a = 865.24(5) pm, V m = 73.140(7) cm 3 /mol, Z = 5.333) and cinnabar (a-HgS) during unsuccessful efforts to synthesize HgCe 2 S 4 by the oxidation of mercury and cerium metal with sulfur (molar ratio 1 : 2 : 4) in evacuated silica tubes at 400 °C in the presence of a fluxing KCl±LiCl mixture within seven days. Their crystal struc-tures belong to the a-Gd 2 S 3 -(A type) or a cation-deficient Th 3 P 4 -type family (C type) according to M 2.667 & 0.333 S 4 (Z = 4) or M 2 S 3 (Z = 5.333), respectively, offering coordination numbers of seven and eight (S 2± arranged as mono-or bicapped trigonal prisms in A-Ce 2 S 3 ) or eight only (S 2± arranged as trigonal dodecahedra in C-Ce 2 S 3 ) to the Ce 3+ cations.

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